# Chapter 4

# Structured linear programming models

# 4.1 Multiple plant, product and period models

The purpose of this section is to show how large linear programming (LP) models can arise through the combining of smaller models. Almost all very large models arise in this way. Such models prove to be more powerful as decision making tools than the submodels from which they are constructed. In order to illustrate how a multiplant model can arise in this way, we take a very small illustrative example.

**Example 4.1: A Multiplant Model**

*standard*and

*deluxe*. A unit of

*standard*gives a profit contribution of £10, while a unit of

*deluxe*gives a profit contribution of £15.

*raw*. The company has 120 kg of

*raw*available per week. To start ...

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